Oscillographic Scatterplots Illustrating Various Degrees of Correlation.

摘要

The random fluctuations of electrons in a resistor (or of ions in a gas tube) have many advantages, as sources of illustrative material for courses in statistics, over games of chance, actuarial experience, and scientific agriculture. A thousand cases, or a million, parade themselves before one's eyes la a single second. In 10 seconds one is almost willing to say that he has seen an infinite population. Moreover, the population is normal. Its standard deviation can be varied by turning a knob. Random samples can be drawn at will: 2 cases, or 20, or 200.